languages/emmet: add module

modules/plugins/languages/default.nix

@@ -14,6 +14,7 @@ in {
     ./clang.nix
     ./css.nix
     ./elixir.nix
+    ./emmet.nix
     ./fsharp.nix
     ./gleam.nix
     ./go.nix

modules/plugins/languages/emmet.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.types) package;
+
+  cfg = config.vim.languages.emmet;
+in {
+  options.vim.languages.emmet = {
+    enable = mkEnableOption "Emmet support";
+    # No treesitter options, as this lsp only adds completions
+
+    lsp = {
+      enable = mkEnableOption "Emmet LSP support (emmet-language-server)" // {default = config.vim.languages.enableLSP;};
+
+      package = mkOption {
+        type = package;
+        default = pkgs.emmet-language-server;
+        description = "emmet-language-server package";
+      };
+    };
+  };
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.emmet_language_server = ''
+        lspconfig.emmet_language_server.setup {
+          capabilities = capabilities,
+          on_attach = default_on_attach,
+          cmd = { "${cfg.lsp.package}/bin/emmet-language-server", "--stdio" }
+        }
+      '';
+    })
+  ]);
+}